说明：该程序可能不具备实用性，仅测试用。
一、使用虚拟串口工具VSPD虚拟两个串口COM1和COM2
二、约定
占一个字节，代码如下：
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text; namespace COMClient
{
/// <summary>
/// 约定
/// </summary>
public enum Protocol
{
Client端发送文件名 = ,
Client端发送数据块 = ,
Client端发送最后一个数据块 = , Server端本次接收完毕 = ,
Server端结束 =
}
}
三、功能说明：
COMClient程序监听COM1串口，COMServer程序监听COM2串口。COMClient先择文件，发送，COMServer接收文件。数据分多次发送，每次发送的数据，通过第一个字节判断发送的这段数据是干啥的，后面的字节是数据本身。
四、COMClient端发送文件
代码：
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;
using System.IO.Ports;
using System.IO;
using System.Threading; namespace COMClient
{
public partial class Form1 : Form
{
#region 变量
/// <summary>
/// 串口资源
/// </summary>
private static SerialPort serialPort = null;
/// <summary>
/// 文件
/// </summary>
private static FileStream fs = null;
private static long index = ;
private static long blockCount;
private static int size = ;
private static DateTime dt;
#endregion #region Form1
public Form1()
{
InitializeComponent();
}
#endregion #region Form1_Load
private void Form1_Load(object sender, EventArgs e)
{
serialPort = new SerialPort("COM1");
serialPort.DataReceived += new SerialDataReceivedEventHandler(serialPort_DataReceived);
serialPort.Open();
}
#endregion #region btnConn_Click
private void btnConn_Click(object sender, EventArgs e)
{
if (openFileDialog1.ShowDialog() == DialogResult.OK)
{
dt = DateTime.Now;
fs = new FileStream(openFileDialog1.FileName, FileMode.Open, FileAccess.Read);
blockCount = (fs.Length - ) / size + ; List<byte> bList = new List<byte>();
bList.Add((int)Protocol.Client端发送文件名);
bList.AddRange(ASCIIEncoding.UTF8.GetBytes(openFileDialog1.FileName));
byte[] bArr = bList.ToArray();
serialPort.Write(bArr, , bArr.Length);
}
}
#endregion /// <summary>
/// 接收串口数据事件
/// </summary>
public void serialPort_DataReceived(object sender, SerialDataReceivedEventArgs e)
{
if (serialPort.BytesToRead == ) return; int bt = serialPort.ReadByte(); switch (bt)
{
case (int)Protocol.Server端本次接收完毕:
if (index != blockCount - )
{
byte[] bArr = new byte[size + ];
bArr[] = (int)Protocol.Client端发送数据块;
fs.Read(bArr, , size);
index++;
Thread.Sleep();
serialPort.Write(bArr, , bArr.Length);
}
else
{
byte[] bArr = new byte[fs.Length - (size * index) + ];
bArr[] = (int)Protocol.Client端发送最后一个数据块;
fs.Read(bArr, , bArr.Length - );
index++;
serialPort.Write(bArr, , bArr.Length);
}
break;
case (int)Protocol.Server端结束:
index = ;
double totalSeconds = DateTime.Now.Subtract(dt).TotalSeconds;
MessageBox.Show("完成，耗时" + totalSeconds + "秒，速度" + (fs.Length / 1024.0 / totalSeconds).ToString("#.0") + "KB/S");
fs.Close();
fs.Dispose();
break;
}
} }
}
五、COMServer端接收文件
代码：
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;
using System.IO.Ports;
using System.IO; namespace COMServer
{
public partial class Form1 : Form
{
#region 变量
/// <summary>
/// 串口资源
/// </summary>
private static SerialPort serialPort = null;
/// <summary>
/// 文件
/// </summary>
private static FileStream fs = null;
#endregion #region Form1
public Form1()
{
InitializeComponent();
}
#endregion #region Form1_Load
private void Form1_Load(object sender, EventArgs e)
{
serialPort = new SerialPort("COM2");
serialPort.DataReceived += new SerialDataReceivedEventHandler(serialPort_DataReceived);
serialPort.Open();
}
#endregion /// <summary>
/// 接收串口数据事件
/// </summary>
public void serialPort_DataReceived(object sender, SerialDataReceivedEventArgs e)
{
if (serialPort.BytesToRead == ) return; #region 接收数据
int bt = serialPort.ReadByte();
List<byte> bList = new List<byte>();
while (serialPort.BytesToRead > )
{
byte[] bArr = new byte[serialPort.BytesToRead];
serialPort.Read(bArr, , bArr.Length);
bList.AddRange(bArr);
}
byte[] receiveData = bList.ToArray();
#endregion switch (bt)
{
case (int)Protocol.Client端发送文件名:
string path = ASCIIEncoding.UTF8.GetString(receiveData);
string fileName = Path.GetFileName(path);
fs = new FileStream(@"d:\_临时文件\COM测试" + fileName, FileMode.Create, FileAccess.Write);
byte[] bArr = new byte[];
bArr[] = (int)Protocol.Server端本次接收完毕;
serialPort.Write(bArr, , bArr.Length);
break;
case (int)Protocol.Client端发送数据块:
fs.Write(receiveData, , receiveData.Length);
fs.Flush();
bArr = new byte[];
bArr[] = (int)Protocol.Server端本次接收完毕;
serialPort.Write(bArr, , bArr.Length);
break;
case (int)Protocol.Client端发送最后一个数据块:
fs.Write(receiveData, , receiveData.Length);
fs.Flush();
bArr = new byte[];
bArr[] = (int)Protocol.Server端结束;
serialPort.Write(bArr, , bArr.Length);
fs.Close();
fs.Dispose();
break;
}
} }
}